It bothers me that this is the only card that uses the term "granulosa-theca tumor," while the rest of our cards use the much more common term, "granulosa cell tumor." This can cause confusion for the learner. We already have a card that highlights the fact that granulosa cell tumors have a "scattering of {{c1::theca}} cells" (nid:1526330773665), so I believe there's no reason not to change this to "granulosa cell tumor."
Sorry to not use an acceptable source, but there's nothing in AMBOSS or FA about "granulosa-theca" tumors. However, this CClinic article states "Granulosa cell tumors (or granulosa theca cell tumors)..." which confirms they are the same thing.
Source: AMBOSS - https://my.clevelandclinic.org/health/body/22528-granulosa-cells
